Machine for serrating cutting edges.



Patented Dec. l0, 190i." 0. c. BROOKS. MACHINE FOB SiERBATING CUTTINGEDGES.

(Application filed July 10, 1901.

(Id llodol.)

WL'ZfiESSeS.

UNITED STATES IPATENT' OFFICE.

CHAPIN C. BROOKS, OF HALLOWELL, MAINE.

MACHINE FOR SERRATING CUTTING EDGES.

SPECIFICATION forming part .of Letters Patent No. 688,384, datedDecember 10, 1901.

Application filed m 10, 1901.

To all whom, it may concern:

Be it known that I, GHAPIN O. BRooKs, a citizen of the United States,residing at Hallowell, in the county of Kennebec and State of Maine,have invented certain new and useful Improvements in Machines forSerrating Cutting Edges; and I hereby declare that the following is afull, clear, and exact description of the invention, which will enableothers'skilled in the art to which it appertains to make and use thesame.

My invention relates to means for cutting grooves in the side or sidesof cutting edges,

whereby the cutting edges are provided with serrations. The cuttingedges thus provided with serrations. are capable of use in theconstruction of tools of various descriptions and such serratededges arehighly desirable in a great variety of tools; but it has hitherto beenimpossible, by reason of the great cost of providing grooves, to makeeconomical use of such serrated edges.

It is the purpose of my invention to provide the means whereby suchgrooves can be made in the side or sides of the cutting edges oftools,whereby theseedges become serrated.

It consists ,in the application of emerywheels or similar cuttingdevices in gangs in such manner as to cut parallel grooves in thesurface of the tools.

It is believed thatthe invention will be understood from the followingdescription, in which- Figure 1 is a side elevation of the machine inwhich Irhave embodied my invention. Fig. 2is an end view of the same.Fig. 3 is a top view of the table, showing the slotted portion thereof.Fig. 4. is a detail showing the'construction of the standard and movableplate at the rear of the machine, and Fig. 5is a detail showing in,vertical cross -section the standard and plates shown in Fig. 4 and thescrew for operating the same.

In the drawings, a is the bed of the machine, upon which are-placed theboxes b b, which support the shaft 0. The shaft at one end carries thepulley (1, while the box at the other end of the shaft is so connectedwith the bed a that it may be removed. This is accomplished by means ofthe cam-lever e or by a bolt and nut or similar means,-(see Fig.

press the surface or the table 7;.

Serial No. 67,736. (No Diode.)

1;) but it is believed that the cam-lever will be found most convenientin practice. The portion of the shaft 0 between the boxes I) b carriesthe emery-wheels ff. These wheels are of the usual construction,separated by collars h h, adapted to be placed upon the shaft 0. Thewheels f f should be of the same diameter as likewise preferablya're thecollars. The collars may be made of varying thickness, as by means ofthe varying thickness of the collars the distance between the groovesproduced is regulated. At the right of the box b the shaft 0 is providedwith a fixed collar g. Againstthisis placed the first emerywheel andthen a collar, and so on,uutil the desired number of wheels has beenplaced upon the shaft. Another collar h is now placed against the lastemery-wheel and the nut 2' set up against it, that portion of the shaftcwhich lies in the neighborhood of the box I) being threaded. Above theshaft 0 is placed the table It, which is shown in detail in Fig. 3. Thistable is provided through the center of its length with a detachableplate,'which may be secured therein by means of screws or any othersuitable means. The plate Z is provided with slots so arranged and ofsuffh cient width to permit the passage through them of theemery-wheels; f f, one slot of course being provided for eachemery-wheel. A plate l must be provided so as to accommodate each set ofemery-wheels, and as the distance between the emery-wheels is changed bymeans of collars of different thickness the corresponding plate Z mustbe placed in the table to receive them. This table is, as alreadystated, placed on the machine above the shaft 0. Normally it should beso placed, that but a small portion of the emery-wheels willbe above thesurface of the plate Z. For convenience I have hinged the table at therear to a slide m. This slide is connected by means of dovetails withthe standard n. A screw is passed upward through the standard n of theslide m, w ereby the screw being provided with a collar beneath thelower surface of the slide m may either elevate or de- The front edge ofthe table rests..upon the screw 19. This screw plays in the frontstandard of the table g, which is provided with the necessary thread, asseen in Fig. 2. The upper end of the screw 10 (shown'in Fig. 2) supportsthe front of the table. The upper end of the screw is surrounded by acoil-spring s, and provision is thus made for supporting the forward endof the table upon the spring .9, the screw being then screwed down. Onthe upper surface of the table may be placed the plate 2, which is shownin Fig. 2. This plate is provided at eit-herend with an ear, by means ofwhich it is pivoted to the table. The plate 1 may be controlled by meansof the cam-lever It or any other convenient means or by hand.

The operation of the device is obvious. It having been decided whatdistance apart the grooves are to be in the surface of the cutting edgeto be treated the emery-wheels are placed upon the shaft 0, soarranged,by means of the collars h h,that they shall be separated by thesame distances as the grooves which it is desired to cut. The tool to beoperated upon is now placed at the front of the table It, over the frontedge of the slotted piece Z, which should be so constructed that thevarying slots are equally distant and the spaces be the same as betweenthe, emerywheels. The machine is now set in motion and the tool operatedupon held down by hand upon the surface of the emery-wheels and whilethe wheel rotates against the surface of the tool from the edge to suchdistance therefrom as may be desired. Of course the tool may be held inplace by means of the plate f and the lever to or by any other means.

The method of operation may be varied in certain classes of tools asfollows: The table k maybe supported at the front upon the coil-springs, and when the tool to be operated upon has been set in proper positionupon the plate I and held in place by the vise consisting of the plate25 and lever u or their equivalent means the table may be depressed to aslight degree by the hands of the operator applied at the front, thusbringing the tool in contact with the wheels and cutting the groovesdesired, when the table is released and a new tool subjected to theoperation as before.

What I claim as my invention is- 1. In a machine for serrating cuttingedges, the combination of a shaft carrying emerywheels with means forseparating said wheels and securing them upon said shaft and a tableabove said shaft provided with a slotted plate adapted to receive theedges of said wheels, substantially as described.

2. In a machine for serrating cutting edges, the combination of a shaftwith a series of emery-wheels thereon, means for separating the saidwheels and securing them upon said shaft, a table above said shaftprovided with a slotted plate adapted to permit the passage of a portionof the periphery of said wheels and means upon the surface of said tablewhereby the edge to be operated upon may be held against said slottedplate, substantially as described.

3. In a machine for serrating cutting edges, the combination of a seriesof emery-wheels and collars for separating the same, means whereby saidwheels and collars may be secured upon said shaft, a hinged table abovesaid shaft, a plate in said table slotted to receive said wheels andmeans whereby the free end of said table may be elevated or depressed,substantially as described.

4. In a machine for serrating cutting edges, the combination of a shaft,emery-wheels and collars and means for securing the same upon saidshaft, a table above said shaft hinged at the back and supported at thefront upon a spring and provided with a slotted plate adapted to receivea portion of the periphery of said wheel, substantially as described.

In testimony that I claim the foregoing as my invention I have hereuntoset my hand this 1st day of July, A. D. 1901.

CHAPIN O. BROOKS.

In presence of GEo. E. BIRD, A. O. BERRY.

